@book {,
	title = {Geograf{\'\i}a del Per{\'u}, tomo I: Las ocho regiones naturales del Per{\'u}},
	year = {1946},
	note = {<p>illus. 24cm.</p>},
	publisher = {Universidad Nacional Mayor de San Marcos},
	organization = {Universidad Nacional Mayor de San Marcos},
	address = {Lima},
	keywords = {defines ecological zones including puna, qwechua, suni},
	url = {http://es.wikipedia.org/wiki/Las_ocho_regiones_naturales_del_Per\%C3\%BA},
	author = {Pulgar Vidal, Javier}
}